LMIA means Labour Market Impact Assessment. It is a certificate that an employer needs to get in Canada before hiring a foreign worker. If there is a shortage of labor in the market and a Canadian employer wants to hire a foreign national, they may need positive LMIA. Under the temporary foreign worker program, you can apply to work in Canada only if you have a job offer and your employer has received LMIA approval. And for this employer needs positive LMIA.